Abstract Neural networks possess formidable representational power, rendering them invaluable in solving complex quantum many-body systems. While they excel at analyzing static solutions, nonequilibrium processes, including critical dynamics during a quantum phase transition, pose a greater challenge for neural networks. To address this, we utilize neural networks and machine learning algorithms to investigate time evolutions, universal statistics, and correlations of topological defects in a one-dimensional transverse-field quantum Ising model. Specifically, our analysis involves computing the energy of the system during a quantum phase transition following a linear quench of the transverse magnetic field strength. The excitation energies satisfy a power-law relation to the quench rate, indicating a proportional relationship between the excitation energy and the kink numbers. Moreover, we establish a universal power-law relationship between the first three cumulants of the kink numbers and the quench rate, indicating a binomial distribution of the kinks. Finally, the normalized kink-kink correlations are also investigated and it is found that the numerical values are consistent with the analytic formula.
We construct a holographic model of superconducting quantum interference device (SQUID) in the Einstein-Maxwell-complex scalar theory with a negative cosmological constant. The SQUID ring consists of two Josephson junctions which sit on two sides of a compactified spatial direction of a Schwarzschild-AdS black brane. These two junctions interfere with each other and then result in a total current depending on the magnetic flux, which can be deduced from the phase differences of the two Josephson junctions. The relation between the total current and the magnetic flux is obtained numerically.
The global warming leads to the rising of the meteorological disasters frequently, and the strength becomes more and more strong. Therefore, the requirements for meteorological service get higher and higher; especially the fast and accurate meteorological service products release gets more interesting. This article embarks on the complexity of meteorological service that includes the complexity of meteorological service departments, meteorological service products, meteorological service objects, meteorological service patterns, and meteorological service release, and analyses the influence of the efficiency of the meteorological service release, which mainly manifested as: the delay of meteorological service products release, release a long time, omissions in meteorological service products release and the repetition distribution of meteorological service products. We proposed the concept of meteorological service products which called one-key publishing, which included technique framework, database of meteorological service release, strategy of release task scheduling and release engine, etc. In addition, task scheduling optimization strategy is proposed based on meteorological service objects priority, meteorological service release method priority, and multithread, multi-process, distributed, high-concurrency processing techniques, which effectively solves the problems of delay, omission and repetition of meteorological service products release. We developed a software middleware for meteorological service products publishing, and it was applied to the construction of meteorological business system. The application has achieved high effect.
Through analyzing the impact of open access to libraries and copyright issues,some measures to deal the copyright problem in the open access environment were put forward.
A bstract We investigate the formation of topological defects in the course of a dynamical phase transition with different boundary conditions in a ring from AdS/CFT correspondence. According to the Kibble-Zurek mechanism, quenching the system across the critical point to symmetry-breaking phase will result in topological defects — winding numbers — in a compact ring. By setting two different boundary conditions, i.e., Dirichlet and Neumann boundary conditions for the spatial component of the gauge fields in the AdS boundary, we achieve the holographic superfluid and holographic superconductor models, respectively. In the final equilibrium state, different configurations of the order parameter phases for these two models indicate a persistent superflow in the holographic superfluid, however, the holographic superconductor lacks this superflow due to the existence of local gauge fields. The two-point correlation functions of the order parameter also behave differently. In particular, for holographic superfluid the correlation function is a cosine function depending on the winding number. The correlation function for the holographic superconductor, however, decays rapidly at short distances and vanishes at long distance, due to the random localities of the gauge fields. These results are consistent with our theoretical analysis.
The intense development of urban–rural integration has brought about a constant increase in people’s demand for public culture. In particular, as the equalization of public cultural services is promoted, narrowing the gap between the services offered in urban and rural settings has gradually become the dominant orientation to promote urban–rural integration and enhance the rights and interests of the people. Starting from the principles of the new public service, this research conducted field interviews in Xuling Town, Anhui Province, China. The Zaltman metaphor elicitation technique (ZMET) was used to analyze the interview content, and five inferences about the construction of township public culture were drawn: (1) cultural facilities have a significant impact on township public cultural construction; (2) the role of cultural talents is essential but lack of talent is normal in townships; (3) carrying out cultural activities is the top priority of township public cultural construction; (4) cultural management is an indispensable auxiliary link but the management level is insufficient; (5) and the cultural activities of traditional festivals are particularly important. Moreover, on the basis of these five inferences, the fuzzy-set qualitative comparative analysis (fsQCA) method was used to analyze the survey data and verify the underlying problems around public cultural service effectiveness as well as resource allocation in township areas. Finally, countermeasures are proposed on how to narrow the gap, which are of reference significance for improving the quality of township public cultural services in the context of urban–rural integration and meeting the cultural needs of residents.
In order to assess the feasibility of neutron bubble detectors (NBD) for monitoring neutron doses in radiation fields of nuclear well logging, neutron dose levels at several positions inside and outside a truck transporting radiation sources for nuclear well logging have been measured and analyzed using both a NBD and a neutron ambient dose equivalent rate meter (NADERM). The relative difference of the sensitivities between a NBD calibrated by a certified 241Am-Be radiation source and a standardized NADERM is 7.4%, well within the counting statistic uncertainties, indicating that the NBD response is similar to the NADERM for this neutron field, and thus is an appropriate dosimeter for this application. The results of statistical analysis show that NBD are reliable for neutron dose monitoring in both pure neutron and n-γ mixed radiation fields of nuclear well logging.
Pairwise comparison matrix (PCM) with crisp or fuzzy elements should satisfy consistency requirements when it is used in analytic hierarchy process (AHP) or in fuzzy AHP methodologies. An algorithm has been presented to obtain a new modified consiste
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